Title :
Pre-equalization for MIMO wireless channels with delay spread
Author :
Sampath, Hemanth ; Bölcskei, Helmut ; Paulraj, Arogyaswami J.
Author_Institution :
Inf. Syst. Lab., Stanford Univ., CA, USA
Abstract :
We consider a downlink finite impulse response (FIR) multi-input multi-output (MIMO) wireless channel with L taps. A is shown that such a channel can be pre-equalized with an FIR MIMO transmit filter with only L taps, if the angle spread due to the different multipaths is sufficiently large at the transmitter. The filter taps are derived for the cases where the transmitter has perfect and partial channel knowledge, respectively. Finally, we present a pre-filter structure which converts the available frequency diversity into spatial diversity. The resulting spatial diversity can then be exploited using conventional receivers designed for frequency-flat fading channels
Keywords :
FIR filters; MIMO systems; delays; diversity reception; equalisers; fading channels; filtering theory; multipath channels; radio links; radio receivers; radio transmitters; FIR MIMO transmit filter; FIR MIMO wireless channels; angle spread; delay spread; downlink wireless channel; filter taps; frequency diversity; frequency-flat fading channels; multi-input multi-output channel; multipaths; partial channel knowledge; perfect channel knowledge; pre-equalization; pre-filter structure; receivers; spatial diversity; transmitter; Delay; Downlink; Equalizers; Fading; Finite impulse response filter; Frequency diversity; Intersymbol interference; MIMO; OFDM; Transmitters;
Conference_Titel :
Vehicular Technology Conference, 2000. IEEE-VTS Fall VTC 2000. 52nd
Conference_Location :
Boston, MA
Print_ISBN :
0-7803-6507-0
DOI :
10.1109/VETECF.2000.886287
